Automatic stop lor lathe-carriages.



PATENTED JULY 5, 1904.

N.D.GHARD. AUTOMATIC STOP FOR LATHE GARRIAGES.

APPLICATION FILED MAR. 21, 1904.

N0 MODEL.

inventor UNITED STATES Patented July 5, 1904.

PATENT OFEicE.

NICHOLAS D. CHARD, OF CINCINNATI, OHIO, ASSIGNOR TO THE LODGE &

SHIPLEY MACHINE TOOL COMPANY, OF CINCINNATI, OHIO, A CORPO RATION.

AUTOMATIC STOP FOR LATHE-CARRIAGES.

SPECIFICATION forming part of Letters Patent No. 7 64,109, dated July 5, 1904.

Application filed March 21, 1904. Serial No. 199,256. (No model.)

To all whom it may concern:

Be it known thatI, NICHOLAS D. CHARD, a citizen of the United States, residing at Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Automatic Stops for Lathe- Carriages, of which the following is a specification.

My invention relates to an automatic stop for the carriage of an engine-lathe.

The features of my invention are more fully set forth in the description of the accompanying drawings, forming a part of this specification, in which Figure 1 is a side elevation partly in section. Fig. 2 is an end view of the trip. Fig. 3 is a section on line a m, Fig. 1. Fig. A is a diagrammatic view illustrating the practical use of the improvement.

A represents the bed of the machine having the usual carriage B, with the depending apron C.

D D represent bearing-plates bolted to the sides of the bed. In the upper bearings GG of these plates is journaled a two-part rod for feeding the carriage E F. The invention is equally applicable to a feed-rod orlead-screw or other feed-shaft. The first partE is journaled in the bearing G of the plate D. Obviously part E is a driving element and part F a driven element connected by the clutch members H I. The part E is projected beyond the bearing G and provided with a clutch member H. The second screw member is at one end journaled in the bearing G of the plate D. The end of the part E is bored to receive the end of the part F.

I represents a coacting clutch member formed on the yoke-sleeve J, splined to the part F, so as to turn therewith and slide thereon.

K represents a driving-gear on the part E.

L represents a shifting-rod journaled in the bearing M M of the plates D D.

N represents a yoke-sleeve fixed to the rod L.

(4 represents a cup secured to the plate D and having a coil-spring Z) engaging the yokesleeve N.

O represents a lever intermediately fulcrumed to the bed by any suitable bolt, the opposite ends of which lever engage into the yoke-sleeves J and N.

P represents an adjustable stop-collar on rod L.

Q, represents a tripping-lever fulcrumed at c to the front end of the apron C. The lower end of the lever is inclined toward the bed of the lathe and is normally in position to engage the stop collar P when the carriage passes the stop-collar. The upper end of the lever Q, is provided with a notch 6, adapted to engage the screw d, screw-threaded into the apron, by means of which the lever may be set out of tripping position. The same arrangement of stop-collar and tripping-lever might, if desirable, be duplicated at the rear of the apron. When the tripping-lever engages against the stop-collar, the rod L will be longitudinally slid in its bearings, thereby shifting the clutch member I to disengaged position through the instrumentalities of yokesleeves J N and lever O.

The spring 6 normally holds the clutches in engaged position. Therefore when the carriage has been automatically stopped whenever the apron is disengaged from the stopcollar the clutches will be automatically engaged and the feed thrown into operation. It is obvious that this convenient arrangement can be readily applied to any conventional engine-lathe without requiring special-construction or special fitting other than the bolting of the attachable parts.

In Fig. 4 I have shown a plurality of stops on the rod L. It is to illustrate the practical Work that I have shown in conjunction with these stops a piece of work such as a lathes'pindle having four shoulders possibly of different length and of different diameter. The stops P, P, P and P are set to the desired length of the faces of the shoulders S, S, S

and S to be formed or finished. The machine is started as soon as the trip-finger Q strikes the first collar P". After forming the first shoulder S the lathe will automatically stop by swinging the handle T, the trip-lever Q may be lifted, and the feed will be automatically thrown in, as previously described.

- In this manner the feed will be automatically stopped when each shoulder is formed, and it is only necessary to lift the trip-lever Q,when the feed will be automatically thrown in again. This is very obviously a simple and useful mechanism, and its precise form may be variously modified without departing from the principles of the invention. The provision of suitable and conventional transmitting devices between the lead-screw member F and the rack Z of the bed is assumed. To trip, forward travel of carriage-rod L must be shifted toward the head-stock, and trip-lever Q, is intermediately fulcrunied to effect this movement.

Having described my invention, I claim- In combination with the carriage-apron of an engine-lathe, a driving member, a driven my hand.

NICHOLAS D. CHARD.

Witnesses:

OLIVER B. KAIsER, LEO ODoNNELL. 

